This 1″ ID 3:1 dual wall adhesive-lined heat shrink tubing provides heavy-duty environmental sealing and insulation for 2–4/0 AWG wire in automotive, marine, and industrial applications. The flexible polyolefin outer layer and internal thermoplastic adhesive form a watertight, corrosion-resistant barrier when heated—ideal for protecting high-amperage splices and connections exposed to moisture, vibration, or chemicals.
Specifications & Features
- Wire Compatibility: 2–4/0 AWG
- Shrink Ratio: 3:1
- Pre-shrink Inner Diameter: 1″
- Recovered Inner Diameter: 0.320″
- Wall Type: Dual wall with heat-activated adhesive lining
- Material: Flame-retardant polyolefin outer layer
- Length: 12″ per piece
- Available Colors: Black, Red, Clear
- Adhesive lining seals out moisture, oil, and contaminants
- Highly flexible for routing over irregular or bulky cable junctions
- Commonly used in marine wiring, battery cables, and high-current harnesses








